From mboxrd@z Thu Jan 1 00:00:00 1970 From: MaoXiaoyun Subject: Re: kernel BUG at arch/x86/xen/mmu.c:1860! Date: Fri, 8 Apr 2011 19:24:35 +0800 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="_460269ca-875f-4047-a8e0-1f9fee0def2b_" Return-path: In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: xen devel Cc: jeremy@goop.org, dave@ivt.com.au, giamteckchoon@gmail.com, ian.campbell@citrix.com, konrad.wilk@oracle.com List-Id: xen-devel@lists.xenproject.org --_460269ca-875f-4047-a8e0-1f9fee0def2b_ Content-Type: multipart/alternative; boundary="_e80b7637-5c0a-4b02-9f72-aa3c3c0fd1c3_" --_e80b7637-5c0a-4b02-9f72-aa3c3c0fd1c3_ Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: quoted-printable Hi:=20 Unfortunately I met the exactly same bug today. With pvops kernel 2.= 6.32.36, and xen 4.0.1. Kernel Panic and serial log attached.=20 =20 Our test cases is quite simple, on a single physical host, we start = 12 HVMS(windows 2003), each of the HVM reboot every 10minutes.=20 =20 The bug is easy to hit on our 48G machine(in hours). But We haven't = hit the bug in our 24G=20 machine(we have three 24G machine, all works fine.) -----Is is possible = related to Memory capacity? =20 Taking a look at the serial output, the Dom0 code is attempting to pin w= hat it thins=20 is a "PGT_l3_page_table", however the hypervisor returns -EINVAL because = it actually is a "PGT_writable_page".=20 =20 (XEN) mm.c:2364:d0 Bad type (saw 7400000000000001 !=3D exp 4000 0000 0000= 0000) for mfn 898a41 (pfn 9ca41) (XEN) mm.c:2733:d0 Error while pinning mfn 898a41 =20 And before that quite a lot abnormal grant table log like : =20 (XEN) grant_table.c:1717:d0 Bad grant reference 4294965983 (XEN) grant_table.c:266:d0 Bad flags (0) or dom (0). (expected dom 0) (XEN) grant_table.c:266:d0 Bad flags (0) or dom (0). (expected dom 0) (XEN) grant_table.c:266:d0 Bad flags (0) or dom (0). (expected dom 0) (XEN) grant_table.c:1717:d0 Bad grant reference 4294965888 (XEN) grant_table.c:1717:d0 Bad grant reference 4294965983 =20 It looks like something wrong with grant table. =20 Many thanks. =20 > From: Jeremy Fitzhardinge > Subject: Re: [Xen-devel] [SPAM] Re: kernel BUG at > arch/x86/xen/mmu.c:1860! - ideas. > To: Ian Campbell > Cc: Dave Hunter , Teck Choon Giam > , "xen-devel@lists.xensource.com" > xen-devel@lists.xensource.com =20 > On 04/06/2011 12:53 AM, Ian Campbell wrote: > > Please don't top post. > > > > On Wed, 2011-04-06 at 00:20 +0100, Dave Hunter wrote: > >> Is it likely that Debian would release an updated kernel in squeeze = with > >> this configuration? (sorry, this might not be the place to ask). > > I doubt they will, enabling DEBUG_PAGEALLOC seems very much like a > > workaround not a solution to me. >=20 > Yes, it will impose a pretty large performance overhead. >=20 > J >=20 >=20 =20 --_e80b7637-5c0a-4b02-9f72-aa3c3c0fd1c3_ Content-Type: text/html; charset="gb2312" Content-Transfer-Encoding: quoted-printable Hi:
     Unfortunately I met the exactly same bug to= day. With pvops kernel 2.6.32.36, and xen 4.0.1.
     Kernel Panic and serial log attached. =

     Our test cases is quite simple, on a single phys= ical host, we start 12 HVMS(windows 2003),
each of the HVM reboot every 10minutes.

     The bug is easy to hit on our 48G machine(in hou= rs). But We haven't hit the bug in our 24G
machine(we have three 24G machine, all works fine.) -----Is is poss= ible related to Memory capacity?

Taking a look at the serial output,  the Dom0 code is attempting to pin what it t= hins
is a "PGT_l3_page_table", however the hypervisor returns -= EINVAL because it actually is a "PGT_writ= able_page".

(XEN) mm.c:2364:d0 Bad type (saw 7400000000000001 !=3D exp 4000 0000 0000= 0000) for mfn 898a41 (pfn 9ca41)
(XEN) mm.c:2733:d0 Error while pinni= ng mfn 898a41

And before that quite a lot abnormal grant table log like :

(XEN) grant_table.c:1717:d0 Bad grant reference 4294965983
(XEN)= grant_table.c:266:d0 Bad flags (0) or dom (0). (expected dom 0)
(XEN)= grant_table.c:266:d0 Bad flags (0) or dom (0). (expected dom 0)
(XEN)= grant_table.c:266:d0 Bad flags (0) or dom (0). (expected dom 0)
(XEN)= grant_table.c:1717:d0 Bad grant reference 4294965888
(XEN) grant_tabl= e.c:1717:d0 Bad grant reference 4294965983

It looks like something wrong with grant table.

Many thanks.

> From: Jeremy Fitzhardinge <jeremy@goop.org>
> Subject: R= e: [Xen-devel] [SPAM] Re: kernel BUG at
> arch/x86/xen/mmu.c:1860! = - ideas.
> To: Ian Campbell <Ian.Campbell@citrix.com>
>= Cc: Dave Hunter <dave@ivt.com.au>, Teck Choon Giam
> <gia= mteckchoon@gmail.com>, "xen-devel@lists.xensource.com"
> xen-devel@lists.xensource.com

> On 04/06/2011 12:53 AM, Ian Campbell wrote:
> = > Please don't top post.
> >
> > On Wed, 2011-04-06 = at 00:20 +0100, Dave Hunter wrote:
> >> Is it likely that Deb= ian would release an updated kernel in squeeze with
> >> this= configuration? (sorry, this might not be the place to ask).
> >= I doubt they will, enabling DEBUG_PAGEALLOC seems very much like a
&g= t; > workaround not a solution to me.
>
> Yes, it will im= pose a pretty large performance overhead.>
> J
>
>

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